How to Plumb a Sink with PEX

This guide provides a comprehensive overview of how to plumb a sink using PEX tubing. We’ll cover everything from the necessary tools and materials to the step-by-step installation process.

What you will need

• Tools:
  • PEX tubing cutter
  • PEX crimp tool
  • Tape measure
  • Pipe wrench or channel locks
  • Utility knife
  • Screwdriver
• Materials:
  • PEX tubing (size will vary depending on your application)
  • PEX crimp rings (size will match your tubing)
  • PEX crimp connections (elbows, tees, etc.)
  • Shut-off valves
  • Sink supply lines
  • Faucet
  • PEX expansion tool (optional)
  • PEX expansion connections (optional)
  • Teflon tape

Choosing PEX

PEX tubing comes in different sizes and colors.

• PEX tubing sizes:
  • 1/2 inch: hot and cold water lines for most sinks
  • 3/4 inch: main water supply line
• PEX tubing colors:
  • Red: hot water
  • Blue: cold water

Planning your layout

It’s essential to plan the layout of your PEX plumbing before starting the installation. Consider:

• Faucet placement: This dictates where to install the hot and cold water supply lines.
• Water supply location: Locate the existing water shut-off valves and plan the path for running PEX from them to the sink.
• Accessibility: Ensure you can reach all connection points easily for installing and crimping PEX fittings.

Installing the shut-off valves

1. Turn off the water supply to the existing plumbing.
2. Remove the existing supply lines from the shut-off valves using a pipe wrench or channel locks.
3. Wrap Teflon tape around the threaded ends of the new PEX shut-off valves.
4. Screw the PEX shut-off valves onto the existing water lines and tighten them securely using a wrench.

Installing the PEX supply lines

1. Cut PEX tubing to the required lengths for hot and cold water lines. Use a PEX tubing cutter for a clean, straight cut.
2. Insert a crimp ring onto the end of each piece of PEX tubing.
3. Slide the tubing onto the corresponding barb of a PEX crimp connection (elbow or tee). Push the tubing all the way onto the barb.
4. Place the crimping tool over the crimp ring and squeeze the handle firmly to secure the connection. Repeat this step for all PEX connections.

Optional alternative: PEX expansion tool:

1. Expand the end of the PEX tubing using the PEX expansion tool.
2. Insert the expanded tubing onto the corresponding fitting until it stops. The expansion will hold the tubing securely within the fitting.
3. Connect the PEX supply lines to the newly installed shut-off valves using PEX fittings and the crimping or expansion method as described above.
4. Connect the other end of the PEX supply lines to the faucet using the supplied faucet connection hoses and tighten them securely.

Turn on the water supply and check for leaks

1. Slowly turn on the water supply at the shut-off valves.
2. Check for leaks at all connection points. If you notice a leak, tighten the crimp ring or fitting as needed.
3. Once satisfied with the connections, you can turn on the faucet and test the water flow.

Can a Leaking PEX Fitting Cause Issues with Plumbing a Sink?

Yes, a leaking PEX fitting can definitely cause issues with plumbing a sink. It can lead to water damage, reduced water pressure, and even mold growth. To prevent this, it’s important to learn some pex fitting repair tips to address any leaks promptly and avoid potential issues.

Conclusion

Plumbing a sink with PEX can be a simple DIY project with the proper instructions and materials. This guide provides a basic overview of the process, and it’s crucial to consult additional resources and local plumbing regulations for specific requirements and best practices.